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Chapter 14: Q5CP (page 557)

Explain in detail, including diagrams, what happens when a negatively charged tape is brought near your finger.

Short Answer

Expert verified

The negatively charged tape gets attracted to the finger.

Step by step solution

01

Significance of the law of attraction

The law of attraction states that like charges repel and unlike charges attract each other. Moreover, a charged particle also attracts a neutral object.

02

Explanation of the given statement

The diagram has been drawn below-

The finger has dipoles, so when the negatively charged tape is brought near to the finger, then the electric field of the finger goes to the tape and the electric field of the tape goes to the finger which creates the attraction.

Thus, the negatively charged tape gets attracted to the finger.

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Most popular questions from this chapter

Figure 14.69 shows a neutral, solid piece of metal placed near two points charges. Copy this diagram.

(a) On your diagram, show the polarization of the piece of metal.

(b) Then, at location A inside the solid piece of metal, carefully draw and label three vectors: (1) E→1, the electric field due to -q1; (2) E→2, the electric field due to +q2; (3) E→3, the electric field due to all of the charges on the metal.

(c) Explain briefly why you drew the vectors the way you did.

In Figure 14.84 there is a permanent dipole on the left with dipole moment μ1=Qs1 and a neutral atom on the right with polarizabilityα , so that it becomes an induced dipole with dipole moment μ2=Qs2=αE1, whereE1 is the magnitude of the electric field produced by the permanent dipole. Show that the force the permanent dipole exerts on the neutral atom isF≈(14πε0)212αμ12r7

8 (a) An object can be both charged and polarized. On a negatively charged metal ball, the charge is spread uniformly all over the surface (Figure 14.42). If a positive charge is brought near, the charged ball will polarize. If any of the following quantities is zero, state this explicitly. (1) Draw the approximate final charge distribution on the ball. (2) At the center, draw the electric field due to the external positive charge. (3) At the center, draw the electric field due to the charge on the surface of the ball. (4) At the center, draw the net electric field.

(b) Next, consider a negatively charged plastic pen that is brought near a neutral solid metal cylinder (Figure 14.43). If any of the following quantities is zero, state this explicitly. (1) Show the approximate charge distribution for the metal cylinder. (2) Draw a vector representing the net force exerted by the pen on the metal cylinder, and explain your force vector briefly but completely, including all relevant interactions. (3) At the center, draw the electric field due to the external negative charge. (4) At the center, draw the electric field due to the charge on the surface of the ball. (5) At the center, draw the net electric field.

(c) Replace the solid metal cylinder with a solid plastic cylinder. (1) Show the approximate charge distribution for the plastic cylinder. (2) Draw a vector representing the net force exerted by the pen on the plastic cylinder. (3) Explain your force vector briefly but completely, including all relevant interactions.

Criticize the following statement: "Since an atom's electron cloud is spherical, the effect of the electrons cancels the effect of the nucleus, so a neutral atom can't interact with a charged object." ("Criticize" means to explain why the given statement is inadequate or incorrect, as well as to correct it.)

Which of the following are true? Select all that apply. (1) In equilibrium, there is no net flow of mobile charged particles inside a conductor. (2) The electric field from an external charge cannot penetrate to the center of a block of iron. (3) The net electric field inside a block of aluminum is zero under all circumstances. (4) If the net electric field at a particular location inside a piece of metal is not zero, the metal is not in equilibrium. (5) The net electric field at any location inside a block of copper is zero if the copper block is in equilibrium.
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